Control Unit (Processor) for Flow Controllers - Specifications and Selection

Product Specifications

Technical details and manufacturing context for Control Unit (Processor)

Definition

The control unit (processor) is the central processing component within a flow controller. It receives sensor data, executes programmed control logic, calculates required adjustments, and outputs commands to actuators to maintain precise flow rates, pressure, or other process variables according to set parameters. This unit continuously monitors input signals from flow sensors and other process variables, compares them against setpoints using embedded control algorithms (such as PID or fuzzy logic), and generates output signals to adjust control valves, pumps, or other actuators to achieve desired flow conditions. The control unit is typically housed in a plastic enclosure and contains a printed circuit board (PCB) with semiconductor silicon components and copper connectors. It operates on a rated supply voltage of 24 V DC ±10% (per IEC 61131-2) and consumes between 5 and 15 watts, depending on the number of I/O points. The processor clock speed ranges from 100 to 400 MHz, with program memory from 1 to 8 MB and data memory from 512 to 2048 KB. Analog input resolution is 12 to 16 bits with an accuracy of ±0.1% of full scale at 25°C (drift with temperature). Digital I/O count is configurable from 8 to 32. Communication protocols include Modbus RTU and Profibus DP (per IEC 61158). Operating and storage temperature ranges are -40 to 85°C (per IEC 60068-2-1 and IEC 60068-2-2), relative humidity 5 to 95% non-condensing (per IEC 60068-2-78), and ingress protection from IP54 to IP65 (per IEC 60529). Weight ranges from 0.5 to 2.0 kg depending on housing and I/O count. These specifications are reference ranges; verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The control unit operates by continuously sampling input signals from flow sensors and other process transmitters. It compares these measured values against user-defined setpoints using embedded control algorithms, such as PID or fuzzy logic. Based on the error between setpoint and measured value, the processor calculates output commands and sends them to actuators like control valves or pumps. The unit also handles digital I/O for limit switches, alarms, and start/stop commands. It communicates with higher-level systems via Modbus RTU or Profibus DP for monitoring and configuration. The processor's clock speed and memory determine the control loop speed and complexity of algorithms that can be executed. The unit is designed to operate within specified environmental limits; exceeding these may cause malfunction. Regular verification of input accuracy and communication integrity is recommended.

Common Materials

Semiconductor silicon, Printed circuit board (PCB), Plastic housing, Copper connectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Supply Voltage	24 ±10% V DC	Outside this range, processor may malfunction.IEC 61131-2
Power Consumption	5–15 W	Higher for models with more I/O.
Processor Clock Speed	100–400 MHz	Determines control loop speed.
Program Memory	1–8 MB	Sufficient for complex algorithms.
Data Memory	512–2048 KB	For process data logging.
Analog Input Resolution	12–16 bit	Higher resolution improves measurement accuracy.
Analog Input Accuracy	±0.1 % FS	At 25°C; drift with temperature.
Digital I/O Count	8–32	Configurable inputs/outputs.
Communication Protocol	Modbus RTU, Profibus DP	For integration with PLC/SCADA.IEC 61158
Operating Temperature	-40–85 °C	Extended range for outdoor use.IEC 60068-2-1, IEC 60068-2-2
Storage Temperature	-40–85 °C	Same as operating for simplicity.IEC 60068-2-1, IEC 60068-2-2
Relative Humidity	5–95 % RH	Non-condensing.IEC 60068-2-78
Ingress Protection	IP54–IP65	IP65 for washdown environments.IEC 60529
Weight	0.5–2.0 kg	Depends on housing and I/O count.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Central Processing Unit (CPU)
Executes control algorithms and performs calculations

Material: Semiconductor silicon
Memory Module
Stores program instructions and temporary data

Material: Semiconductor silicon with metal interconnects
Input/Output Interface
Connects to sensors and actuators for data exchange

Material: Copper connectors, PCB
Power Supply Circuit
Converts external power to required voltages for internal components

Material: PCB, electronic components (capacitors, resistors)
Communication Module
Enables data exchange with external systems via protocols (Modbus, Profibus, Ethernet)

Material: PCB, communication chips

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Flow Controller

View system integration details

Manufacturers of Control Unit (Processor)

Manufacturer profiles associated with Control Unit (Processor).

Sourcing Control Unit (Processor) from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the function of the control unit in a flow controller?

The control unit processes sensor signals, executes control algorithms, and outputs commands to actuators to regulate fluid flow according to setpoints.

What communication protocols are supported?

The control unit supports Modbus RTU and Profibus DP, per IEC 61158, for integration with PLC or SCADA systems.

What are the environmental limits for operation?

Operating temperature is -40 to 85°C, relative humidity 5-95% non-condensing, and ingress protection IP54 to IP65. Exceeding these may cause malfunction.

How should I verify the specifications for my application?

The listed values are reference ranges. Always confirm model-specific values and standards with the legal manufacturer or supplier before selection.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Control Unit (Processor)

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	0 to 100 bar
flow rate:	0-1000 L/min
temperature:	-20°C to +70°C
slurry concentration:	0-30% solids by weight

Control Unit (Processor)

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards